| Source | Code | Name | Case count | Share of cases (%) |
|---|---|---|---|---|
| CANC | CANC_TOPO(C809)_MORPHO(8000)_BEH(3) | Unknown primary site, Neoplasm, malignant | 205 | |
| DEATH | DEATH_ICD10(C80) | Malignant neoplasm, without specification of site | 182 | |
| CANC | CANC_TOPO(C809)_MORPHO(8140)_BEH(3) | Unknown primary site, Adenocarcinoma, NOS | 119 | |
| DEATH | DEATH_ICD10(C800) | Name not found | 79 | |
| CANC | CANC_TOPO(C809)_MORPHO(8070)_BEH(3) | Unknown primary site, Squamous cell carcinoma, NOS | 59 | |
| CANC | CANC_TOPO(C809)_MORPHO(9680)_BEH(3) | Unknown primary site, Malignant lymphoma, large B-cell, diffuse, NOS | 59 | |
| CANC | CANC_TOPO(C809)_MORPHO(8010)_BEH(3) | Unknown primary site, Carcinoma, NOS | 56 | |
| CANC | CANC_TOPO(C809)_MORPHO(8246)_BEH(3) | Unknown primary site, Neuroendocrine carcinoma, NOS | 31 | |
| DEATH | DEATH_ICD10(C809) | Name not found | 29 | |
| DEATH | DEATH_ICD9(1990X) | Disseminated malignant neoplasm without specification of site | 21 | |
| CANC | CANC_TOPO(C809)_MORPHO(8240)_BEH(3) | Unknown primary site, Carcinoid tumor, NOS | 17 | |
| CANC | CANC_TOPO(C809)_MORPHO(9591)_BEH(3) | Unknown primary site, Malignant lymphoma, non-Hodgkin, NOS | 14 | |
| CANC | CANC_TOPO(C809)_MORPHO(8480)_BEH(3) | Unknown primary site, Mucinous adenocarcinoma | 13 | |
| CANC | CANC_TOPO(C809)_MORPHO(8249)_BEH(3) | Unknown primary site, Atypical carcinoid tumor | 10 | |
| CANC | CANC_TOPO(C809)_MORPHO(9670)_BEH(3) | Unknown primary site, Malignant lymphoma, small B lymphocytic, NOS | 10 | |
| CANC | CANC_TOPO(C809)_MORPHO(8720)_BEH(3) | Unknown primary site, Malignant melanoma, NOS | 9 | |
| CANC | CANC_TOPO(C809)_MORPHO(8041)_BEH(3) | Unknown primary site, Small cell carcinoma, NOS | 7 | |
| CANC | CANC_TOPO(C809)_MORPHO(9590)_BEH(3) | Unknown primary site, Malignant lymphoma, NOS | 7 | |
| CANC | CANC_TOPO(C809)_MORPHO(9741)_BEH(3) | Unknown primary site, Malignant mastocytosis | 7 | |
| CANC | CANC_TOPO(C809)_MORPHO(8020)_BEH(3) | Unknown primary site, Carcinoma, undifferentiated, NOS | 6 | |
| CANC | CANC_TOPO(C809)_MORPHO(9673)_BEH(3) | Unknown primary site, Mantle cell lymphoma (Includes all variants: blastic, pleomorphic, small cell) | 6 | |
| CANC | CANC_TOPO(C809)_MORPHO(9702)_BEH(3) | Unknown primary site, Mature t-cell lymphoma, NOS | 6 | |
| CANC | CANC_TOPO(C809)_MORPHO(9699)_BEH(3) | Unknown primary site, Marginal zone B-cell lymphoma, NOS | 5 |